New words：

cycle ['saikl]
n.循环；周期；自行车；摩托车
v.骑自行车；骑自行车旅行

Sample Sentences：

He goes to work by cycle.
Cycling is Europe's second most popular sport.
She cycled round the corner, lost her balance and fell off.

A cycle of the sun takes a year.
The seasons of the year spring, summer, autumn and winter make a cycle.

balance ['bæləns] n.平衡；均衡

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